Rs232 Interface - SimCom SIM300D User Manual

SIM300D EVB User Guide

3.5 RS232 Interface

Serial Port 1——MAIN Interface
Serial Port 2——DEGUG Interface
Main Interface:
Pin Signal
1 DCD
2 TXD
3 RXD
4 DTR
5 GND
7 RTS
8 CTS
9 RI
Debug Interface:
Pin Signal
2 DEBUG_TX
3 DEBUG_RX
5 GND
SIM300D-EVB_UGD_V1.01
Figure 8: Serial Ports
I/O
O
O
I
I
I
O
O
I/O
O
I
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Description
Data carrier detection
Transmit data
Receive data
Data Terminal Ready
GND
Request to Send
Clear to Send
Ring Indicator
Description
Transmit data
Receive data
GND